Marking typo support (#18)

* Adding (pre-)processors, this introduces support for Marking Typo's (opt in, won't be used by default)
* Go mod update (to 1.19, from 1.17)

Adding Exact() matching

Tiny bugfix, only relevant if you roll your own Docker image.

Updated dependencies

Switched to TOML configuration format and the headers are now configu…

…rable

Changed key distance behaviour a bit

Keyboard aware

Adding a webserver

Tagging the first usable release